JPS62118182A - Circular-section clamping stack and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology is applicable to a method in which an inner tube and an outer tube such as a double tube, or an inner body and an outer tube such as a cylindrical body are aligned in the axial direction, the circumferential direction, or belongs to the field of technology in which the devices are tightly fitted in both directions so that no relative displacement occurs during operation.

<Summary of the gist> The invention of this application is directed to an inner body such as an inner tube having a circular cross section and an outer tube such as an outer tube having a circular cross section in the axial direction, circumferential direction, or
The present invention relates to a structure of a multi-layered body with a circular cross section which is restrained and tied together so that relative displacement does not occur in both, and a method of manufacturing the multi-layered body, and in particular, the invention relates to an inner tube or a columnar body with a circular cross-section. An inner body and an outer cylinder with a circular cross section are layered together to bond them together, and at this time, a slip prevention body is formed facing them, and the outer cylinder is subjected to annular heating and annular cooling. This invention relates to a circular cross-section fastened layered body in which a slip prevention body is tightly connected to an inner body and an outer cylinder, and a method for manufacturing the same.

<Prior art> As is well known, corrosion-resistant pipes and wear-resistant pipes are used for piping used in chemical plants, etc., and multiple conditions such as heat resistance, pressure resistance, corrosion resistance, and wear resistance are required. A single-layer pipe that can satisfy these requirements with a single material has not yet been technologically developed. Therefore, a double-layered pipe structure is used in which an inner pipe and an outer pipe are polymerized to function individually. Back-up rolls with sleeves used for rolling, etc. have a structure in which a core material is formed into a column on the inside, and a wear-resistant sleeve is layered on the outer surface of the core material.

In the case of a tightly bound multilayer body with a circular cross section, such as a double pipe or a backup roll with a sleeve, in which an outer cylinder with a circular cross section is layered over an inner body with a circular cross section, there are technical aspects, economic conditions, and specifications. There is a mode in which the conditions are complicatedly intertwined, and the bond is mechanically bonded in layers rather than in a metallurgical bond.

<Problems to be solved by the invention> In some cases, such piping and jigs are maintained in a statically set state during operation.
It may be used under conditions of severe thermal changes, or under conditions of intense rotation, axial guidance, etc. Under these conditions, due to thermal behavior and mechanical operation, the circular cross-section There may be a relative misalignment between the inner body of the inner tube or column and the outer cylinder with a circular cross section in the axial direction, circumferential direction, or both directions, which is an unfavorable state or must be absolutely avoided. As is well known, dowel pins, knot turbines, keys, etc. are used to deal with this situation, but in any of these cases, one of the inner body, the outer cylinder, or , these anti-slip bodies are used in a penetrating state on both the inner surfaces and the outside, and a part is exposed, so they tend to loosen during use, and from a mechanical structure point of view,
Another disadvantage is that the surface lacks uniformity due to the chemical conditions for thermal behavior.Furthermore, the process of attaching these anti-slip bodies to tightly connect the inner body and outer cylinder becomes complicated. However, it also had the disadvantage of being difficult to manage, resulting in high costs.

In cases where the outer cylinder is thicker than the inner body to achieve greater strength, it may not be possible to connect the two by means such as shrink fitting, depending on the size of the outer cylinder. Additionally, temperature control is extremely difficult, and the diameter of the outer cylinder cannot be reduced as designed.

In addition, in order to ensure a tight connection, the outer surface of the inner body and the inner surface of the outer cylinder must be mechanically manufactured to a mirror finish to maintain their adhesion, which makes the process extremely complicated and reduces the precision of the process. There was also the inconvenience that it was impossible to actually work because of the strict requirements.

The purpose of the invention of this application is to provide a structure of a layered body in which an outer cylinder with a circular cross section is tightly connected to an inner body with a circular cross section such as a double pipe or a shaft based on the above-mentioned prior art, and problems in the manufacturing process thereof. is a technical problem to be solved, and the relative displacement between the two in the circumferential direction, axial direction, or both directions is restrained apart from the boundary between them, and the outer surface of the outer cylinder, the outer surface of the inner body, or , an excellent circular cross-section tightly bound layered body that forms a uniform phase on the inner surface and integrates the inner body and outer cylinder, thereby benefiting the fields of application such as piping technology and jig technology in various industries, and its The purpose is to provide a manufacturing method.

In order to solve the above-mentioned problems, the structure of the invention of this application, which is based on the above-mentioned claims, is to solve the above-mentioned problems. The inner body and the outer cylinder with a circular cross section are formed separately, and the outer surface of the former and the inner surface of the latter are provided with a circumferential direction, an axial direction,
Alternatively, a slip prevention body for both directions may be formed in advance, and depending on the embodiment, a separate slip prevention body may be further formed to be interposed between the two, and the inner body and the outer cylinder may be separated by a predetermined gap to maintain the mutual weight. The inner and outer tubes are layered, and the outer cylinder is heated in an annular shape and the surrounding area is cooled in a manner such that the anti-slip bodies correspond to each other. Tight P3
As a result, both slip prevention bodies, or both slip prevention bodies and another slip prevention body are tightly connected and integrated into a multilayer body, and when the multilayer body is in operation, the slip prevention body prevents the slippage prevention body from moving in the circumferential direction. , technical measures have been taken to ensure that there is no relative deviation in the axial direction or both directions, and to always perform the specified function in the initial set state.

<Example> Next, an example of the present invention will be described below based on the drawings.

In the embodiment shown in FIGS. 1 to 4, the embodiment is a production mode of a wear-resistant double pipe such as a slurry transport pipe as a circular cross-section tightly bound multilayer body, and the outer pipe 1 as an outer cylinder includes, for example, Using a low-cost, high-toughness material such as low-carbon steel with a carbon content of about 0.25%, a predetermined number of hemispheres 2 are integrally formed on the inner surface at a predetermined position to serve as a slip prevention body. In addition, the inner tube 3 serving as the inner body is made of wear-resistant material, such as high carbon steel with about 10.55% carbon, and the four hemispherical faces 4 are offset in correspondence with the hemispherical body 2. A corresponding number of preventers are formed, quenched and hardened, and in a state where both are completely cooled, they are loosely inserted relative to each other as shown in FIG. 1 to form a double tube blank tube 5.

The double tube blank tube 5 is set so as to be movable in the axial direction at a predetermined speed as shown by the arrow, and furthermore, as shown in FIG. The high-frequency induction heating device 6 is set, and a cooling device 7 is installed at the front and rear of the axis in the vicinity of the high-frequency induction heating device 6 at a predetermined distance.
．． 1 and move the double tube blank tube 5 in the direction of the arrow so that the heating device 6 and the cooling devices 7 and 7 are moved relative to the double tube blank tube 5.

Therefore, when the double tube blank tube 5 is moved at a predetermined speed, the heating device 6 applies an expansion effect due to heating to the cooling of the outer tube 1 by the cooling devices 7.7 before and after it. As schematically shown by the dotted lines in Figure 2, if both ends of the heating part are free ends with respect to the cooling part, the diameter will expand freely and protrude in the circumferential direction, as shown in Figure 2. In reality, since both ends of the heated portion are restrained by the cooling portion, the heated portion yields, and as a result, a ring-shaped curved plastically deformed portion is formed.

As the double-pipe blank tube 5 moves relatively in the direction of the arrow, the part heated by the heating device 6 and plastically deformed passes through the heated part and is cooled by the cooling device 7.7, and conversely becomes large. The outer tube 1 is tightly connected to the inner tube 3 with a large fitting allowance, and the hemispherical body 2 of the outer tube 1 is connected to the corresponding hemispherical concave surface 4 of the inner tube 3. It will be fitted and tightly connected.

Since this action acts on all circumferential portions of the outer tube 1, by continuously moving the double tube element tube 5 relative to each other in the axial direction, all portions of the outer tube 1 are reduced in diameter, and the entire circumferential portion is reduced. In the double-pipe material pipe 5, a tight fit state appears with respect to the inner pipe 3, and the hemisphere 2 and the four hemispherical surfaces 4 are tightly fitted, resulting in a large size that is tightly connected in both the circumferential and axial directions. A self-contained double pipe is formed.

The above-mentioned tightening process is performed regardless of the wall thickness of the inner tube 3, and since it is formed in the full double tube blank tube 5 regardless of the axial length, the outer tube 1 and the inner tube This process has almost no relation to the accuracy of the joint surface of the tube 3, and is extremely effective in manufacturing wear-resistant double tubes where the inner tube 3 has a large wall thickness and is a long tube. be.

In this way, a double tube 8 as a multi-layered body as shown in FIG. The hemisphere body 2 and the hemispherical concave surface 4, which act as a set number of deviation prevention bodies, are firmly connected, and are installed in the piping of a chemical plant, etc., and are used in harsh environments with severe thermal behavior that are fixed at high temperatures in summer and low temperatures in winter. Even when operated under these conditions, the outer tube 1 and the inner tube 3 do not cause any relative displacement in the circumferential direction as well as in the axial direction.
In this case, a hemispherical body 2 and a hemispherical concave surface 4 as a slip prevention body
The larger the number of , the more reliably the integral thermal behavior is guaranteed.

In the above-mentioned embodiment, the layered body is a double pipe for use in a chemical plant, but in the embodiment shown in FIG. This is an embodiment of the roll 8', in which the inner tube 3 of the above-mentioned embodiment is made into a cylindrical inner body 3', and the four hemispherical surfaces 4 correspond to the hemispherical bodies 2 of the predetermined number of slip prevention bodies of the outer tube 1. is formed in a concave manner, and in the manufacturing process, the annular heating and annular cooling are shifted in phase to a predetermined value as in the above-described embodiment, and the diameter of the outer cylinder 1 is reduced by relative movement in the axial direction as in FIG. This is an embodiment in which the inner body 3' of the columnar body 2 of the hemispherical body 2 is tightly fitted into the hemispherical concave surface of the anti-slip body.

Therefore, in the roll 8' of this embodiment, even under conditions of severe dynamic operation, the inner body 3' as a core body
On the other hand, the outer cylinder 1 as a sleeve can function as designed as a roll of one block in the initial formation without causing any phase shift not only in the axial direction but also in the circumferential direction and in the spiral shape. In this embodiment, as in the previous embodiment, the wall thickness of the outer cylinder 1 and the finishing accuracy of the opposing surface at the boundary with the inner body 3' do not need to be carried out so strictly.

As described above, in the invention of this application, the inner body with a circular cross section may be a tube body or a columnar body, and therefore, the opposing surface with a circular cross section where the outer cylinder with a circular cross section is tightly connected to the inner body is a tube such as a double tube. It can be applied to either a body or a column, and the binding structure of the binding surface may be such that it is prevented from slipping in the circumferential direction, the axial direction, or both. For the inner body 3, for example, wave-shaped anti-slip bodies 41 as shown in FIG. Alternatively, as shown in FIG. 8, hemispherical and hemispherical anti-slip bodies 43 can be formed by shifting them alternately in a staggered manner, or as shown in FIG. 9. Similarly, the outer tube 1 and the inner tube 3 may be formed with hemispherical concave surfaces 44, 44, and a separate spherical body 45 may be interposed between the inner tube 3 and the outer tube 1, and the inner tube 1 and the outer tube 1 may be tightly connected as a slip prevention body. is also possible.

It should be noted that the embodiments of the invention of this application are of course not limited to the above-mentioned embodiments. For example, the anti-slip body can prevent a hemisphere, a hemispherical surface, etc. from shifting in the circumferential direction and in the axial direction. However, it is also possible to form a slip prevention body for either one of them, and the materials used include inexpensive and highly tough carbon steel pipes, hardened high carbon steel, low alloy steel, and wear-resistant steel. High-chromium cast steel, high chromium cast steel, and ceramics such as mullite, alumina, and silicon nitride are also used, and the formation of the inner body and outer circle using these materials can be selected as appropriate depending on the specification conditions and the occasion. Various aspects can be adopted.

<Effects of the Invention> As described above, according to the invention of this application, in a multi-layered body in which an outer cylinder having a circular cross section is tightly connected to an inner body such as a tube or a pillar body having a circular cross section, both A circumferential, axial, or both-direction slip prevention body is formed at the boundary, and both are tightly connected in a state where they are cut off from the outside, making it possible to operate under severe operating conditions with large annual temperature ranges. It is possible to prevent deviations due to thermal behavior and maintain a stable initial position, and even in multi-layer bodies such as rolling machines that involve intense mechanical movements such as rolls, the core body and sleeve can be This provides an excellent effect in that the slip prevention between the two parts is maintained, and rolling, etc., can be performed as designed without any change over time.

Furthermore, since both the inner body and the outer cylinder are shielded from the outside, the inner surface of the inner body and the outer surface of the outer cylinder can maintain a uniform surface phase, preventing corrosive fluids and other external An excellent effect is achieved in that deterioration or change due to sliding with other members is avoided, and functions are uniformly performed on all sides.

Also, when layering an outer cylinder with a circular cross section on an inner body with a circular cross section and bonding them together, a slip prevention body may be formed in advance on the opposing surfaces of the both mutually or through another material. By facing each other and tightening, there is no need for the conventional exterior process such as dowel pins, bolts, keys, etc., and the effect of process simplification is that the inner body and outer cylinder can be tightened just by the tightening process. be done.

Furthermore, by shifting the phase of the annular heating and annular cooling to the outer cylinder and moving it relative to the outer cylinder in the axial direction, the outer cylinder can be heated through a large fitting allowance regardless of the wall thickness of the outer cylinder. It has the excellent effect of being able to firmly connect to the inner body.

[Brief explanation of drawings]

The drawings are detailed explanatory views of the invention of this application.
The figures are explanatory diagrams of the manufacturing process of a multi-layered body according to one embodiment, in which Fig. 1 is a vertical cross-sectional view of a part of the layered body of the inner body and outer cylinder, Fig. 2 is a partial longitudinal cross-sectional view of the reduced diameter of the outer cylinder, and Fig. 3 is a partial vertical cross-sectional view of the bound multi-layered body, FIG. 4 is a schematic perspective view of the fastening of the anti-slip body, FIG. 5 is a partial vertical cross-sectional view of another embodiment of the multi-layered body corresponding to FIG. 9 to 9 are schematic vertical cross-sectional views of the fastening structure of various anti-slip bodies.

Claims (2)

[Claims] (1) In a multi-layered structure in which an outer cylinder with a circular cross section is tightly connected to an inner body with a circular cross section, the boundary between the outer cylinder and the inner body is cut off from the outside of both. A bonded layered body structure with a circular cross section, characterized in that a slip prevention body is formed. (2) In a method of manufacturing a bonded multilayer body with no relative displacement by layering an inner body with a circular cross section and an outer cylinder with a circular cross section and then bonding the two, the opposing surfaces of both the inner body and the outer cylinder A slip prevention body is formed in advance and phase layered, and annular heating and annular cooling are performed on the outer cylinder by shifting the positions in the axial direction, and the outer cylinder and the inner body are tightly connected by interposing the displacement prevention body. A method for producing a tightly bound layered body with a circular cross section, characterized in that: